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PHYSICS
IGCSE




PHYSICSTM -Roshan Rao

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Formulae

Average speed = distance/time

Average acceleration = change in velocity/time taken.

Gravity = height of the fall x2/ time^2 (g = 2h/t^2).

Resultant force = mass x acceleration (f = ma)

Density = mass/volume

Weight = mass x g (w=mg)

Force = mass x acceleration.

Pressure = force/area

Work…

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Speed of sound = distance travelled / time taken

*echo = x2 distance to wall / echo time

Refractive index = speed of light in a vacuum / speed of light in
medium (n=c/v)

Refractive index 2 = sin i/ sin r

Magnification = image height / object height

Angle…

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Resultant force (momentum) = change in momentum/ time
Power = energy transformed/ time taken

Power = voltage x current

Power = current^2 x time Electrical
energy
Energy transformed = power x time

Energy = voltage x current x time

Energy supplied = power (kW) x time (h)

Transformer turns ratio…

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Units

Speed = m/s (meters per second)

Acceleration = m/s^2 (meters per second squared)

Gravity = m/s (meters per second) (free fall),
M/s^2 (meters per second squared) (acceleration due to gravity),
N/kg (newtons per kilogram) (weight)

Resultant force = N (newtons)

Density = m^3 (meters cubed)

Weight = N (newtons)…

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Wave length = m (meters)

Speed of sound = (approx.) air: 330m/s, liquid: 1,500m/s,
Solid: 5,000m/s

Speed of light in a vacuum = 3,000,00 km/s (3,000,000 m/s)

Density of water = 1.0g/ cm^3
Density of aluminium = 2.7g/ cm^3
Density of copper = 8.9g/ cm^3
Density of lead = 11.4g/…

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Circuit Symbols

Made from a metallic conductor so current can
Wire easily pass from one part of the circuit to
another

On/Off switch ­ in open position the circuit is
Switch (open)
broken so no current flows

On/Off switch ­ in closed position the circuit is
Switch (closed)
complete and…

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Speed, velocity and acceleration

Speed
Speed: the distance travelled between two points usually measured
in m/s (meters per second).

Average speed = distance/time.

Velocity
Velocity: the speed of an object and its direction.

For direction you can use words such as forward, backward, left,
right and for motion in a…

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Free Fall

Free fall: where something is falling with the effects of gravity and
air resistance acting on it.

Gravity (g) = 10m/s^2 (or 9.8m/s^2 to be more precise).
.
G (gravity) =acceleration of free fall.
.
To measure g the formula is

Gravity = height of the fall x2/…

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Speed time graph

On a speed time graph the gradient tells u how much speed is
gained every second (how fast the object is accelerating).

The gradient is equal to the acceleration.

To find the distance travelled you must find the area under the line.

If the gradient is diagonal…

Comments

Maddie

what board is this for?

liverpool7867

its for cambridge (CIE)

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